Differentiate. (a) f(x) = 3x2 - 2 cos x (b) f(x) = sin x + 1/2 cot

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Differentiate.
(a) f(x) = 3x2 - 2 cos x
(b) f(x) = sin x + 1/2 cot x
(c) y = sec θ tan θ
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